Jack



E. B. BIRD.

JACK. APPLICATION FILED SEPT. 26. l919 Patented June 22, 1920.

17.3.5 ird,

IPIIIIIIIII'IIII UNITED STATES EMERSON B. BIRD, OF SEATTLE, WASHINGTON.

JACK. I

Application filed September 26, 1919.

T 0 all whom it may concern:

Be it known that I, EMERsoN B. BIRD, citizen of the United States,residing at 1698 Terry avenue, Seattle, in the countyof King and Stateof \Vashington, have 1nvented certain new and useful Improvements inJacks; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will anable others skilledin the art to which it appertains to make and use the same.

This invention relates to jacks and more particularly to jacks forautomobiles although it is not limited thereto.

An object of this invention is to provide a jack of simplifiedconstruction and of easy manual operation and a jack in which thereactionary forces are minimized as tending to force the pawl mechanismin causing it to become disengaged under minimum resistance of the handcontrolling operating means.

A further object of this invention is to provide a unitary member forserving for varied purposes in jacking varied objects and having reducedstress action upon its engaging portions in its operation.

A further object of this invention is to provide an improved jack of thetype in which the handle is lifted in releasing the pawl and in whichthe reverse motion is quickly and simply accomplished by reversing themovement of the handle.

lVith these and other objects in view, the invention consists of theconstruction, combination and the detail and arrangement of parts ashereinafter more fully described and claimed.

In the drawings:

Figure 1 is a side elevation of this jack.

Fig. 2 is a construction in part at 22 of Fig. 1.

Fig.

Fig. mount.

Fig. 5 is a detail of the upper ball race at 22 in Fig. 1.

Fig. 6 is a detail of the collar guarding the lever support.

Fig. 7 is a modified form of this device.

In detail the invention comprises a cylindrical unitary sleeve support 2being screw threaded in its interior to mate with the screw threads 3'in a spindle 4, the said spindle 4 being mounted and having a bearing inthe standard 5, and a thrust ball 3 is a detail of the standard.

4 is a detail of the ball bearing Specification of Letters Patent.

Patented June 22, 1920.

Serial No. 326,462.

bearing-6 (Figs. & and 5) to receive the weight upon the said jack, andhaving a collar 7 serving as a bearing for a lever 8, the said lever 8having pivoted thereon a b1furcated pawl 9, and the said pawl 9 having aV shaped projection 10 for engaging a counter V shaped projection 11.The pawl 9 is adapted to engage the teeth of a ratchet 12 fixedlymounted on the spindle 1. A handle 13 is pivoted to the lever 8 at 14;to move in a vertical plane and provided with an abutment member 15which operates the V shaped member 11 yieldingly against a spring 16 sothat when the handle 13 is in horizontal relation the V shaped member 11engages the V shaped projection 10 in pawl 9 and causes the pawl 9 toengage the geared teeth 12 in the direction in which the handle is beingturned. When the handle 13 is lifted the V shaped member 11 is releasedfrom abutment 15 and forced backward by the spring 16 out of engagementwith the projection 10 of pawl 9, thus releasing pawl 9 from engagementwith the teeth of gear 12 and admitting of a backward or other desiredmovement of the said handle without the engagement of the pawl with thesaid teeth.

In the modification shown in Fig. 7, the hinged lever 13 is providedwith an offset pawl 9 adapted to directly engage the gear 12.

lVhat I claim is:

1. In a jack, the combination of a base having avertical bore, a spindlerotatably mounted in said base. a thrust hearing between said spindleand base, a sleeve adapted to be mounted on said spindle, said spindleand sleeve having co-mating threads, and means mounted on said spindlebetween said base and said sleeve to rotate said spindle, said rotatingmeans comprising a ratchet attached to said spindle, a collar rotatablymounted on said spindle above said ratchet. a hinged lever having oneend mounted on said collar, a double acting pawl pivoted to said lever,and a sliding element carried by said lever and operated by the hingingthereof on its pivot for throwing said pawl.

2. In a jack having a base, a partially threaded spindle and co-matingthreaded sleeve, a spindle operating device comprising in combination aratchet, a hinged lever rotatably carried on the spindle, a doubleacting pawl carried by said lever and adapted to engage s'aid ratchet,and a reciprocating spring controlled element adapted to control saidpawl and to be operated by the hinging of said lever.

3. In a jack having a threaded spindle means for rotating said spindlecomprising in combination a ratchet fixed to said spindle, a memberrotatably mounted on said spindle adjacent to said ratchet, a doubleacting pawl carried by said rotatable member, adapted to engage saidratchet, a slida'ble member carried by said rotatable memi said pawl andat the same time to operate said pawl comprising a lever pivoted to saidrotatable member and having an offset shoulder adapted toengage saidsliding 20 member substantially as specified.

In testimony whereof I affix my signature.

EMERSON B. BIRD.

and means for throwing 15

